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The Youanmi Gold Mine is a gold mine 82 km south-south-west of the town of Sandstone. It is near the abandoned town of Youanmi, in the Murchison Region of Western Australia. The mine, currently owned by OZ Youanmi Gold Pty Ltd, has been placed in care and maintenance since 1997.〔(First Youanmi drillhole intersects high grade gold ) APEX ASX announcement, published: 5 December 2007, accessed: 22 January 2010〕〔(APEX annual report 2009 ) published: 23 October 2009, accessed: 22 January 2010〕 In 1994, Youanmi became the first mine to commercially use the BACOX process (previously owned by BacTech Mining Corp, which is now REBgold Corp).〔(Youanmi, Australia ) REBgold Corp., accessed: 15 February 2011〕 This patented process, which is a proprietary of REBgold and BacTech Environmental, is a process of bacterial oxidation and bioleaching technologies that liberate precious metals from difficult-to-treat sulphide ores and concentrates, using naturally occurring bacteria.〔(Responsible mining through green technology ) REBgold Corp., accessed: 15 February 2011〕〔(Who are using biotechnologies? ) technology.infomine.com, accessed: 22 January 2010〕 Incidentally, the Wiluna mine uses a similar process, the BIOX process.〔(THE GEOLOGIST’S GUIDE TO THE BIOX PROCESS ) accessed: 13 December 2008〕 The name Youanmi derives from a spring in the area and was first recorded in 1887. It was given to a surveyor by an old Aboriginal accompanying him, but its meaning is unclear.〔(History of country town names - Y ) landgate.wa.gov.au, accessed: 23 January 2010 〕 ==History== After a first gold discovery in 1896,〔(Dromedary Hills, Youanmi - Murders on the Rabbit Proof Fence ) accessed: 23 January 2010〕 gold mining at Youanmi was carried out around 1908 and carried on until 1942, when the Youanmi Gold Mine was shut for the first time. The town of Youanmi rose and fell with the mine, finding itself deserted after the closure of the mine.〔(Youanmi, Australia ) BacTech Mining Corp., accessed: 22 January 2010〕〔(Youanmi: A History of Murchison Gold ) Book describtion, accessed: 23 January 2010〕 The mine was, in those days, owned by London-based company Bewick Moreing.〔('The abomination of desolation spoken of by the prophet what's-his-name' ) australianhumanitiesreview.org, accessed: 24 January 2010〕 The current mine has its origins in the 1980s, when an open pit operation commenced.〔(Annual Report 2008 ) APEX ASX announcement, published: 24 October 2008, accessed: 22 January 2010〕 In 1995, the mine moved to underground mining, where between 50,000 and 60,000 ounces of gold were mined per year, at an average grade of 11.5 g/t. In November 1997, the mine was closed because low gold prices, below A$400 per ounce, made the Youanmi mine uneconomic.〔(Apex unveils gold strategy with three WA acquisitions ) APEX ASX announcement, published: 3 May 2007, accessed: 22 January 2010〕 At the time of its closure, Youanmi had produced 670,000 ounces of gold throughout its lifetime.〔(Youanmi Project ) Voltaresources website (formerly Goldcrest), accessed: 22 January 2010〕 On 27 June 2000, Aquilia Resources Limited was listed on the Australian Securities Exchange, thereby becoming the owner of the mine, taking over from their parent companies, Quartz Mountain Mining Pty Ltd and Australian Mineral Investors Pty Ltd . In October 2003, Aquilia sold the Youanmi mine, which id called its ''Enterprise/Penny West Project'', to Goldcrest Resources for A$2.75 million.〔''The Australian Mines Handbook: 2003-2004 Edition'', page 83〕 APEX purchased Youanmi in May 2007 from Goldcrest Resources Ltd for A$10 million, half of this in cash. It was purchased almost simultaneously with the Gidgee Gold Mine from Legend Mining for A$11 million.〔 APEX's initial plan was, to refurbish and enlarge the Gidgee processing plant and use it as a central processing facility for ore from Younami and Gidgee, where it would mine the ''Wilson'' deposit. Production was to commence in 18 to 24 month. Parts of the Younami processing plant were to be relocated to Gidgee while the remainder would be used for the company's Aphrodite project. Younami was to initially contribute 170,000 tonnes of ore to the future gold production, sourced from the existing underground operations below 600 meters, which would have to be dewatered and refurbished first.〔 With the acquisition of the Wiluna Gold Mine in June 2007, Wiluna replaced Gidgee as the location of the central processing facility. Gidgee, like Youanmi, were to serve as mining locations only, with ore from Youanmi to be transported to Wiluna, over 320 km north-east of Youanmie. APEX also increased their production target from 120,000 to 200,000 ounces per annum because of the larger Wiluna plant and the lack of need to move parts of the Youanmi plant to Wiluna.〔(Apex expands WA gold consolidation with Wiluna acquisition ) APEX ASX announcement, published: 20 June 2007, accessed: 22 January 2010〕 APEX announced first successful drilling results from Youanmi in December 2007 and anticipated that mining at Youanmi would commence in 2009.〔 In January 2008, APEX begun to dewater the open pit at Youanmi in order to gain access to the submerged underground portal, the pit being filled with 1.8 million cubic meters of water.〔 It anticipated that the pit would be dewatered by the end of 2008, underground dewatering would start in early 2009 and ore production in the third quarter of 2009.〔(Apex commits to project development at Wiluna and Wilsons ) APEX ASX announcement, published: 23 June 2008, accessed: 21 January 2010〕 The company revised this plan, however and decided to only proceed with the development of the Wiluna mine, deferring mining at Youanmi to 2010.〔 It halted all exploration activities at Gidgee and Younami, too.〔 Difficulties encountered in the underground mining and plant commissioning at Wiluna forced APEX to go through a number of capital raisings, the latest in September 2009, when the company raised A$108 million. Consequently, APEX share price fell from a height of A$1.40 in early 2008 to below 4 cent by the end of 2009.〔(Australian Securities Exchange - APEX ) accessed: 21 January 2010〕〔(Apex raising at fallen share price ) ''The Sydney Morning Herald'', published: 23 September 2009, accessed: 21 January 2010〕 Subsequently, APEX returned to its previously abandoned strategy of sourcing ore from Gidgee as well as Wiluna for its processing facility. It now plans to commence mining at Gidgee once more in March 2010, while production from Youanmi is not planned any more at this time.〔 In late December 2009, APEX announced a further delay with the development of the Gidgee mine because of the need of an upgrade of the Gidgee - Wiluna road. APEX anticipates that mining could be delayed another two or three month.〔(Wiluna Update ) APEX ASX announcement, published: 22 December 2009, accessed: 21 January 2010〕 The company has no immediate plans with Youanmi at the time and has not stated whether it is still continuing to dewater the operation,〔 making a reopening in the near future unlikely. In April 2010, APEX announced that it was considering selling the mine as it didn't consider it a core asset anymore.〔(Youanmi Gold Project ) APEX ASX announcement, published: 9 April 2010, accessed: 12 April 2010〕 Since the first quarter of 2013, APEX engaged the OZ Youanmi Gold Pty Ltd for the sale issue of Youanmi Project. After a long time negotiation between the two parties, the final sale agreement was signed in May 2013. The execution of the sale agreement conducted in October 2013 between the two parties. Though APEX has gone into receivership in July 2013, Ferrier Hodgson has been appointed as the Receiver. OZ Youanmi Gold has placed the mine as it was, the care and maintenance status. The company has a plan to do more drill work and seek business partners to reopen the mine. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Youanmi Gold Mine」の詳細全文を読む スポンサード リンク
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